Improvement in chronometer-escapements



J. KARR. Chrnometer Escapement.

110.51191. Parend Nov. 28, 1865.

UNITED STATES PATENT OFFICE.-

JAOOB KARR.i OF WTASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN CHRONOMETER-ESCAPEMENTS.

Specification forming part of Letters Patent No. 51,191 dated November 28, 1865.

To all whom it may concern:

Be it known that I, JACOB KARR, ot' Washington, D. O., have invented an Improvement upon my Chronometer-Escapeinent for which I received Letters Patent No. 44,317, dated September 20, 1864, and I do hereby declare that the followingis a full, clear, and exact de' scription ot' the same, reference bein g had to the annexed drawings, making a part of this specification.

Figures l and 5 show the lever t'orm, and Fig. 7 the cylinder form of my invent-ion in its true position with the improvement. Fig. 6 shows the lever detached from the other works. Fig. 8 shows a simple modification ofthe lever. Figs. 2 and 3 represent the lever form, and Fig. 4 the cylinder form ot' my invention patented September 20, 1864.

The construction and position ot' my improved cscapement is identical with that of my former invention, above mentioned, with the exception of the following specific particulars: I dispense with the short leverD, Figs. 2 and 3. I make the lever or lance O of sutticient length, and place the spring E on the opposite side of the lance O in such a manner that it will extend a little past the end of the lever or lance O, and in such manner and position that it will perform all the functions ot' the short lever, I), in its action with the other works for the purpose of escapement. I construct the detent or pallet plate B with or without the pallet-point y, Figs. 1, 5, and 7, (both in the le ver and cylinder.) The pallet-pointy andthe locking-spring g perform the same action, and they may be used separately or combined. The lock-sprin g g may be made spiral in form.

I will proceed to describe the action ot' my improved escapement.

Referring to Fig. the balance-wheel, in its forward or unlocking motion, strikes with its pallet a the end ot' the spring e, which rests against the point t of the lance O. The result of the blow is to move the lever on its axis a so far as to disengage or unlock the pallet x of the detent, or pallet-plate b from the toothl of the escapement-wheel, and allow the pallet a to pass the end of the lever. As soon as the escapement-wheel is unlocked, tooth4 catches the pallet e ot' the coming balance and carries it forward At the expiration ot` two-thirds or the time in which the pallet z of the balanceis being carried forward by tooth 4 of the escapement-wheel, tooth 2 strikes the palletpoint y ot' the detent d, and returns the lever to its lock position, aided by the loclespriligg. Either the pallet y or the spring g will accomplish the lock position ot' the lever, but where both are used greater certainty in the action ot'locking is attained. The contact ot'the pallet y with the tooth 2 and the tooth 4 of the escapement-wheel with the balance-palletzceases at the sanie instant. The bala-nce being disengaged from the cscapcment-wheel by the l'ull power of its spring, is driven backward in its reverse motion, the pallet a encountering only the spring e, which gives back sufficiently to let it pass without disturbing the lock position ot" the lever, when it is again ready toev ecute the torward unlocking motion.

Referring to Fig. 5, the action is the same as above described, except that immediately after the unlocking ot tooth l tooth 3 of the escapement-wheel acts upon the balance-pallet e, and the lock position of the lever is secured only by the lock-spring g, the pallet-point y being left ot't' ofthe detent d.

Referring to the cylinder forni of my invention, Fig. 7, tooth 1 acts on both the pallets .fr and y ot'thc detent b in the action ot' escape ment.

From actual trial I find that my improvement above described is practically superior in its action to my invention patented Sep tember 20, 1864.

l claim- 1. Providing the detent b, in both its lever and cylinder t'orm, with the additional pallet y, for thc purposes substantially as above de scribed. Y

2. In combination, the lever with its lance O, springe, and detent b, the pallet c, and pallet a ot' the balance, and the lock spring g, operat ing in the manner above described.

J. KARR.

Titnessesz A. YV. WITZTIBER, C. S. MATTooN. 

